Gas safety · UK pillar guide
Gas Safety Certificate (CP12): the definitive UK guide
Annual landlord gas safety record for every let property with gas. Everything a landlord needs on one page — the law by nation, the process, pricing guidance, and every area we cover.
Straight answer
Landlord Gas Safety Record (commonly called a CP12)
If you let a property with gas appliances in any UK area, the law requires a gas safety check every 12 months, carried out by a Gas Safe registered engineer. The record it produces — the CP12 — goes to your current tenants within 28 days, and to new tenants before they move in.
Landlords must have every gas appliance and flue they provide checked by a Gas Safe registered engineer at least every 12 months, keep the record for two years, give tenants a copy within 28 days of the check, and give new tenants a copy before they move in.
Equivalent annual duty applies in Northern Ireland; engineers must be Gas Safe registered.
Gas safety
Who can legally issue a CP12?
Exactly one kind of person: an engineer on the Gas Safe Register, the official register that replaced CORGI across Great Britain, with an equivalent scheme covering Northern Ireland. Registration is per-person and per-work-category — an engineer registered for boilers isn't automatically registered for gas fires — and every engineer carries an ID card listing the categories on the back. The register is free to search online, and checking it takes less time than reading a review.
For landlords the practical consequence is simple: a gas safety record signed by anyone else isn't a legal record at all. The document must carry the engineer's name, signature and registration number alongside the results for every appliance and flue checked. If a quote is unusually cheap, the registration check is the first filter — it removes the pretenders faster than any price comparison.
Gas safety
What does the annual check involve — and what doesn't it?
The check opens with a tightness test at the meter, proving the installation holds pressure with no leaks, then works through each landlord-owned appliance in turn: operating pressure or heat input, combustion performance, flame supervision devices, ventilation to the room, and the stability and condition of the appliance itself. Every flue is checked for effective removal of combustion products. Defects are classified by severity on the spot, and immediately dangerous appliances can be disconnected with your permission.
Two boundaries matter. First, a safety check is not a boiler service: the service is maintenance, the check is a pass/fail safety inspection, and only the check is legally required — though combining both in one visit is usually economical. Second, appliances the tenant owns are outside your record, but the pipework serving them is inside it, and any flue you own serving a tenant appliance stays in scope.
Gas safety
How does the two-month renewal window work?
The regulations borrow the MOT's best idea: have the renewal check done at any point in the two months before the current record expires and the new record runs from the old expiry date, not the check date. Booking early therefore costs nothing — you never lose certificate time — and it buys slack for access problems, engineer availability and remedial work.
The arithmetic worth diarising is the deadline, not the window: a record dated 10 June expires 10 June the following year, and the safe zone for renewal opens 10 April. Keep each record for at least two years as the law requires; keeping the unbroken chain for the life of the property is better practice, because history answers questions single documents can't.
Gas safety
What happens if a landlord doesn't comply?
Gas safety failures are criminal offences under the Gas Safety (Installation and Use) Regulations 1998, investigated and prosecuted by the HSE rather than the council. Sentencing can reach unlimited fines and, in the gravest cases, imprisonment — gas is the compliance area where enforcement is at its least forgiving, because the failure mode is carbon monoxide.
The civil consequences bite sooner. In England a landlord who hasn't provided the gas record generally can't serve a valid Section 21 notice, stalling possession until the paperwork is cured. Licensing schemes expect the current record on file; insurers expect it after any incident; and tenant copy deadlines — 28 days for existing tenants, before occupation for new ones — are duties in their own right, not courtesies.
Gas safety
How do the rules differ across the UK?
Less than almost any other certificate. The 1998 regulations apply across Great Britain, and Northern Ireland operates parallel regulations to the same effect, so the annual cycle, the Gas Safe-registered engineer requirement, the record contents and the tenant copy rules are consistent wherever the property sits.
The differences that do exist are contextual rather than substantive: Scotland folds gas safety into the Repairing Standard's evidence expectations, and licensing regimes in each nation decide how the record is requested and checked. The certificate itself is the same document doing the same job everywhere — which is why it anchors most landlords' compliance calendars.
FAQ
Every common question, answered
What is a CP12 gas safety certificate?
CP12 is the industry nickname for the Landlord Gas Safety Record — the document a Gas Safe registered engineer issues after checking each gas appliance, flue and pipework in a rental property. Landlords letting property in your area must have this check done every 12 months.
Who can carry out a gas safety check in your area?
Only an engineer on the Gas Safe Register may legally carry out landlord gas safety checks anywhere in the UK, including your area. Always ask to see the engineer's Gas Safe ID card — you can verify it on the official register.
How often does a landlord need a gas safety check?
Every 12 months. You can arrange the renewal check any time in the two months before the current record expires and keep the original expiry date — the MOT-style rule — so booking early never shortens your certificate.
Do I have to give tenants a copy of the gas safety record?
Yes. Existing tenants must receive a copy within 28 days of the check, and new tenants must get one before they move in. For rental periods under 28 days, displaying a copy in the property is acceptable.
What happens if I let a property in your area without a valid gas safety record?
It is a criminal offence under the Gas Safety (Installation and Use) Regulations 1998. Cases are prosecuted by the HSE and can lead to unlimited fines and, in serious cases, imprisonment. A missing record can also block a valid Section 21 notice in England.
How long does a gas safety check take?
Typically around 30 to 60 minutes for a property with a boiler and one or two additional gas appliances. More appliances, or access issues, extend the visit.
What if an appliance fails the gas safety check?
The engineer records the defect and classifies how dangerous it is. Immediately dangerous appliances may be disconnected with your permission. You must have faults fixed by a Gas Safe engineer before the appliance is used again; the record itself lists the defects found.
What does the gas safety record actually include?
It lists each appliance and flue checked, the checks performed, defects found and action taken, the engineer's name, registration number and signature, the property and landlord details, and the date of the check.
Is a gas safety check the same as a boiler service?
No. The safety check confirms appliances are safe to use; a service is a maintenance clean and inspection of the boiler itself. Many landlords in your area book both together because the engineer is already on site, but only the safety check is a legal requirement.
Do tenants' own gas appliances need to be on my record?
Appliances owned by the tenant are not the landlord's responsibility to check, but the pipework serving them is, and any flue serving a tenant appliance that you own must be included. Note the division of responsibility in your tenancy agreement.
My your area property has no gas supply — do I still need a CP12?
No. If the property has no gas supply or gas appliances, the gas safety regulations do not apply. If the supply is merely capped but a live meter remains, taking professional advice is sensible before assuming you are exempt.
Do the same gas rules apply in Scotland, Wales and Northern Ireland?
Yes — the Gas Safety (Installation and Use) Regulations 1998 apply UK-wide (Northern Ireland has parallel regulations to the same effect). The annual check, the 28-day tenant copy rule and Gas Safe registration requirements are consistent across all four nations.
How long must I keep gas safety records?
Keep each record for at least two years. Because defects and history can matter in disputes, many landlords keep the full chain of records for the life of the tenancy — digital copies are fine.
What if my tenant refuses access for the gas check?
You must take all reasonable steps: written requests, offering alternative dates, and keeping evidence of each attempt. You may not force entry. A documented paper trail of reasonable attempts is what the HSE expects if access is ultimately refused.
Are the gas rules different for an HMO in your area?
The annual check itself is the same, but HMO licensing (administered by your local council) usually requires you to provide the current gas safety record with your licence application and on request. Check your licence conditions for any extra record-keeping duties.
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